Boring tool and holder



O NW0 s 1933: @Amms? 113M 17? BORING TOOL AND HOLDER Filed July 9, 1931 Patented Nov. 1, 1932 UNITED STATES PATENT OFFICE EMIL GAIRING,

OF DETROIT, MICHIGAN, ASSIGNOB TO GAIBING TOOL COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN BORING TOOL AND HOLDER Application filed July 9, 1981.

tion is to provide means whereby a drill or cutting tool may be securely locked and held in the socket of the tool holder against accidental release either when the tool is in operation or at rest.

With the foregoing and other objects in view which will appear as the description proceeds, the invention further resides in the details of construction hereinafter described and claimed, it being understood that changes may he made in the precise em bodiment of the invention herein disclosed without departing from the spirit of the same.

In the drawing accompanying this specification:

. Figure 1 is a longitudinal central sectional view through a boring tool and its holdingsocket,with parts in elevation.

Figure 2 is a side elevation of the socket member.

Figure 3 is a cross-sectional view through the socket of the tool holder, taken on or about line 3-3 of Figure 1, showing a transverse locking pin supported in the wall of the socket.

Figure 4 is a cross-sectional view through the socket and shank of the tool, taken on or about line 4-4 of Figure 2, indicating a spring lodged in a bore in the wall of the socket, formed with a detent integral therewith, projecting into a short longitudinal groove at the end of the tool shank.

Figure 5 is a'similar cross-sectional view through the holding socket and shank of the to0l,the tool shank having been rotated in relation to the socket,-thespring detent is indicated as shifted to bear upon a flat longitudinal passage-way, extending from the end of the toolshank to an annular peripheral groove in which the transverse locking pin is shown seated in dotted lines.

Figure 6 is a perspective view of a tool,-

Serial No. 549,837.

with a pilot rod in position, adapted for a right hand drive.

Figure 7 is a fragmentary perspective. view of the'socket of the tool holder showing the transverse locking pin supported in the wall of the socket, and the spring detent latter.

Figure 8 is a perspective View of a fragment of a tool shank adapted for a left hand drive.

Referring now to the letters of reference placed upon the drawing:

A denotes a socket provided with a tapering shank A for insertion in a suitable chuck not shown.

B indicates a pilot rod having an enlarged head 3, contacting with the end of the boring tool through the adjustment of a nut C, screwed upon the opposite end of the rod,in turn bearing upon the end of the tool shank.

D designates a boring tool with a shank D cut away at its end to provide a fiat longitudinally extending surface D to permit the shank to slide over a transverse locking pin E, supported in the wall of the socket A, upon inserting the shank in the socket of the holder.

D denotes an annular peripheral groove formed in the shank D,-opening at one end onto the flat longitudinally extending por-' tion or passage-way D",to receive a transverse locking pin E, upon rotating the shank when in the socket.

1) indicates a relatively short groove, ex

tending longitudinally from the end of the shank adjacent to, but spaced from the flattened surface or passage-WayD ,-see Figures 6 and 8,to receive the detent of a flat spring F, having a return bend F with one end eX-" lodged in a transverse bore in the wall of the The tool shank having been inserted in the socket of the tool holder, it is then rotated 8 in relation to the latter-to the right or lcft-dependent upon its constructien for right or left hand drivc-see Figures 6 and 8so that the transverse pin E may enter the annular peripheral groove 1) formed in the 10 shank, thereby locking the tool in the holder.

Upon rotating the tool in the socket, the detent or raised portion F of the spring 1*, passes from the groove D onto'the fiat 1ongitudinal surface D thus securing the tool shank in the holder against accidental release.

Having thus described my invention, what I claim is':'

1. In a device of the character described, a socket member, a tool provided with a circular shank formed with'a relatively short annular peripheral groove and a straight fiat longitudinal passage-way leading from the end of the tool shank to said groove; said shank having also a relatively short longi- 26 tudinal groove extending from the end of the shank adjacent to the straight flat longitudinal passage-way; a transverse pin supported in the wall of the socket member; and a spring lodged in a bore formed in the wall 80 of the socket member, having a detent, adapted upon inserting the tool shank into the T socketi member to enter the relatively short longitudinal groove in the shank substantially concurrent with the entry of the trans- 85, verse pin onto said flat longitudinal passage- "way, whereby upon rotating the tool shank in relation to the socket member, said trans verse pin is directed into the annular peripheral groove formed in the shank, to lock 4 the shank to the socket member, said spring detent being simultaneously shifted from the longitudinal groove in the tool shank to impinge upon the adjacent flat longitudinal passage-way in the tool shank, thereby hold- 4 ing the tool against accidental release from its locked driving position in the socket member.

2. In a device of the character described, a socket member, a tool provided with a circular shank formed with a relatively short annular peripheral groove and a straight fiat longitudinal passage-way, leading from the end of the tool shank to said groove; said shank having also a relatively short longitudinal groove extending from the end of' the shank adjacent to the straight flat transverse longitudinal passage-way; a transverse pin supported in the wall of the socket member; a plug adated to close the open end of a ore formed in the wall of the socket member; a spring housed in the bore secured at one end to said plug having a projecting detent adapted to extend into the longitudinal groove in the tool shank, said detent being adapted upon the rotation of 1,sse,177

the shank in relation to the socket member to ride onto the flat wall of the longitudinal passage-way concurrently with the entry of the transverse locking pin into the annular groove in said shank, whereby it may impinge upon' the flat wall of said longitudinal Tpassage-way to secure the tool against accidental rotation or release from its locked driving position in the socket member.

3. In a device of the character described, the combination of a socket member; and a tool provided with a circular shank formed with a relatively short annular peripheral groove and a substantially flat longitudinal passage-way connecting the peripheral groove with the end of the tool shank; a transverse locking pin supported in the wall of the socket member adapted upon entering the shank into the socket member to traverse the longitudinal fiat passage in the shank of the tool and upon rotating the tool shank in relation to the socket to enter the peripheral groove in the shank, thereby locking the tool shank in the socket member; and a spring supported in the ,wall of the socket member including a projecting detent, extending into a longitudinal groove in the tool shank, adapted upon the rotation of said tool shank in the holder to engage the flattened portion of the tool shank, whereby the tool shank is held against accidental rotation and release from the socket member. 1 1 Y 4. In a device of the character described, the combination of a socket member and a tool provided with a circular shank formed with a relativel short annular peripheral groove and a su stantially fiat longitudinal passage-way connecting the peripheral groove with the end of the tool shank; a transverse locking pin supported in the wall of the socket member adapted upon entering the shank into the socket member to A gtraverse the longitudinal flat passage in the shank of the tool and upon rotating the tool shank in relation to the socket to enter the peripheral groove in the shank, thereby locking the tool shank in the socket member; and a spring havin a return bend lodged in a bore in the soc et member, formed with a detent midway its length and extending into a'longitudinal groove in the tool shank adjacent the fiat longitudinal passage-way, whereby upon inserting'and rotating the tool shank in relation to the socket member, said detent may be thereby shifted into impinging engagement 'with the flat wall of the longitudinal passage of said shank to secure the latter against accidental release from the socket member.

5. In a device of the character described, a socket member having a locking pin supported in its annular wall extending tangentially across the socket opening; a tool shank flattened longitudinally to provide a passage for said locking in when inserted in the socket member; said tool shank having a relatively short annular groove opening into said flattened longitudinal passage; an a spring lodged in a chamber formed in the annular wall of the socket member with a detent extending through a slot in the annnf ar wall of the socket member into a longitudinal groove in the tool shank whereby upon the rotation of the tool shank in relation to the socket member to effect the entry of the locking pin into the annular groove said detent is concurrently shifted from sai longitudinal groove into impinging contact with the flattened wall of the tool shank to secure the latter against accidental release from the socket member In testimony whereof, I sign this specification.

EMIL GAIRING. 

